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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 5100 |
| 3 | 305727048000 |
| 4 | 7748770873210669158912000 |
| 5 | 476007332700693200670745550306381336371200000 |
| 6 | 272661655519533773844144991586798737775635133552905539740860416000000000 |
[1,3,5100,305727048000,7748770873210669158912000, 476007332700693200670745550306381336371200000, 27266165551953377384414499158679873777563513355290\ 5539740860416000000000] |